/*
 * Copyright 2012 Aphid Mobile
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package cn.com.winning.ecare.utils;

import java.io.*;
import java.nio.charset.Charset;

import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class IO
{
	private IO()
	{
	}

	public static final byte[] EMPTY_BYTES = new byte[0];

	public static final Charset UTF_8 = Charset.forName("UTF-8");

	public static void close(Closeable closeable)
	{
		try
		{
			if (closeable != null)
				closeable.close();
		}
		catch (IOException e)
		{}
	}

	public static byte[] readData(InputStream input)
	{
		if (input == null)
			return null;
		ByteArrayOutputStream output = new ByteArrayOutputStream();
		byte[] buf = new byte[1024];
		int len = -1;

		try
		{
			while ((len = input.read(buf)) != -1)
			{
				output.write(buf, 0, len);
			}

			return output.toByteArray();
		}
		catch (IOException e)
		{
			return null;
		}
		finally
		{
			close(input);
		}
	}

	public static String readString(InputStream input)
	{
		if (input == null)
			return null;
		return readString(new InputStreamReader(input, UTF_8));
	}

	public static String readString(Reader reader)
	{
		if (reader == null)
			return null;
		StringBuilder builder = new StringBuilder();
		char[] buf = new char[1024];
		int len = -1;

		try
		{
			while ((len = reader.read(buf)) != -1)
			{
				builder.append(buf, 0, len);
			}

			return builder.toString();
		}
		catch (IOException e)
		{
			return null;
		}
		finally
		{
			close(reader);
		}
	}

	public static Bitmap readBitmap(InputStream input)
	{
		if (input == null)
			return null;

		try
		{
			return BitmapFactory.decodeStream(input);
		}
		catch (Exception e)
		{
			return null;
		}
		finally
		{
			try
			{
				input.close();
				input = null;
			}
			catch (IOException e)
			{
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

	public static Bitmap readBitmap(AssetManager manager, String name)
	{
		try
		{
			return readBitmap(manager.open(name));
		}
		catch (IOException e)
		{
			return null;
		}
	}
}
